The Space Interferometry Mission (SIM) will measure
astrometric reflex motions of stars to unprecedented
precision. This will make possible detection and
characterization of the orbits of subJupiter-mass planetary
companions around nearby solar-type stars.

We report results of simulation of planet detection by the
SIM instrument. We consider ensembles of stars observed in
narrow-angle mode. Each star may have one or more
companions. For various signal strengths, we determine (from
analysis of a time series of simulated differential delay
measurements over a five year observing campaign) the
confidence level at which we can state that a companion
exists. We determine threshold signal strength at which it
is possible to identify the orbital periods present in the
system and assign each companion unambiguously to its proper
parent star. We determine threshold signal strengths at
which it is possible to determine orbit parameters such as
inclination, semi-major axis and period of each companion.

These results are preliminary in nature and not to be taken
as final description of the capability of the SIM
instrument.

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